Is a stipulation allowing the capital provider to recall a presumed Zakat payment valid?

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If the capital provider states, "I informed you this is an advanced Zakat payment, and I have the right to take it back," and the recipient denies the prior notification, the recipient's statement is accepted. This is because the recipient is denying an act (notification), and the default principle is the absence of notification. The recipient must take an oath regarding this denial.